edm::storage Namespace Reference

Namespaces
	IOFlags

Classes
class	DavixFile
class	DavixStorageMaker
class	DCacheFile
class	DCacheStorageMaker
class	File
class	GsiFTPStorageMaker
class	HttpStorageMaker
class	IOBuffer
struct	IOPosBuffer
class	LocalCacheFile
class	LocalFileSystem
class	LocalStorageMaker
class	LStoreFile
class	LStoreStorageMaker
class	RemoteFile
class	StatisticsSenderService
class	Storage
class	StorageAccount
class	StorageAccountProxy
class	StorageFactory
class	StorageMaker
class	StormLcgGtStorageMaker
class	StormStorageMaker
class	XrdFile
class	XrdStorageMaker

Typedefs
typedef int	IOFD
typedef int64_t	IOOffset
typedef size_t	IOSize
typedef edmplugin::PluginFactory< StorageMaker *()>	StorageMakerFactory

Enumerations
enum	IOMask {   IORead = 0x01, IOWrite = 0x02, IOUrgent = 0x04, IOAccept = 0x08,   IOConnect = 0x10 }

Functions
IOSize	IOSized (IOOffset n)

Variables
constexpr int	EDM_IOFD_INVALID = -1
constexpr int	PREFETCH_PROBE_LENGTH = 4096

Detailed Description

Proxy class that wraps SEAL's #Storage class with one that ticks #StorageAccount counters for significant operations. The returned #Storage objects from #StorageMaker are automatically wrapped with this class.

Future improvement would be to implement more methods so that the wrapper itself doesn't cause peroformance degradation if the base storage does actually implement "sophisticated" features.

Typedef Documentation

IOFD

typedef int edm::storage::IOFD

Type the system uses for channel descriptors.

Definition at line 23 of file IOTypes.h.

IOOffset

typedef int64_t edm::storage::IOOffset

Type for file offsets for I/O operations, including file sizes. This type is always compatible with large files (64-bit offsets) whether the system supports them or not. This type is signed.

Definition at line 20 of file IOTypes.h.

IOSize

typedef size_t edm::storage::IOSize

Type for buffer sizes in I/O operations. It measures units in memory: buffer sizes, amounts to read and write, etc., and is unsigned. Never use IOSize to measure file offsets, as it is most likely smaller than the file offset type on your system!

Definition at line 15 of file IOTypes.h.

StorageMakerFactory

typedef edmplugin::PluginFactory<StorageMaker *()> edm::storage::StorageMakerFactory

Definition at line 7 of file StorageMakerFactory.h.

Enumeration Type Documentation

IOMask

enum edm::storage::IOMask

I/O operation mask.

Enumerator
IORead
IOWrite
IOUrgent
IOAccept
IOConnect

Definition at line 26 of file IOTypes.h.

              {
    IORead = 0x01,    //< Read
    IOWrite = 0x02,   //< Write
    IOUrgent = 0x04,  //< Exceptional or urgent condition
    IOAccept = 0x08,  //< Socket accept
    IOConnect = 0x10  //< Socket connect
  };

Function Documentation

IOSized()

IOSize edm::storage::IOSized ( IOOffset  n )

inline

Safely convert IOOffset n into a IOSize quantity. If n is larger than what IOSize can hold, it is truncated to maximum value that can be held in IOSize.

Definition at line 37 of file IOTypes.h.

References dqmiodumpmetadata::n.

                                    {
    // If IOSize and IOOffset are the same size, largest positive value
    // is half of maximum IOSize.  Otherwise all bits of IOSize work.
    IOOffset largest = (sizeof(IOOffset) == sizeof(IOSize) ? ~IOSize(0) / 2 : ~IOSize(0));
    return IOSize(n > largest ? largest : n);
  }

Variable Documentation

EDM_IOFD_INVALID

constexpr int edm::storage::EDM_IOFD_INVALID = -1

Invalid channel descriptor constant.

Definition at line 9 of file IOTypes.h.

Referenced by edm::storage::DCacheFile::abort(), edm::storage::File::abort(), edm::storage::DCacheFile::close(), edm::storage::File::close(), edm::storage::File::duplicate(), edm::storage::File::flush(), edm::storage::DCacheFile::open(), edm::storage::File::open(), edm::storage::DCacheFile::position(), edm::storage::File::position(), edm::storage::File::resize(), edm::storage::File::size(), and edm::storage::File::sysduplicate().

PREFETCH_PROBE_LENGTH

constexpr int edm::storage::PREFETCH_PROBE_LENGTH = 4096

Definition at line 18 of file Storage.h.

Referenced by TStorageFactoryFile::ReadBufferAsync().